Auscultating the Heart Sounds Should Result in a "Lub-Dup" Sound

question 57

Multiple Choice

Auscultating the heart sounds should result in a "lub-dup" sound when using the bell and the diaphragm of the stethoscope.What causes the "lub" sound?

• A)Opening of the AV valves
• B)Opening of the semilunar valves
• C)Closing of the AV valves
• D)Closing of the semilunar valves

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